It is used to collect samples used for experiments and reagents made into small pieces. There is no problem in terms of strength, but the display (size) of the product is small. Those bags with different sizes are fine, but close-sized ones are hard to understand as they look pat. The size should be displayed large.

I usually purchased it at a 100 yen shop, but clearly said that the product of Monotaro was better than ever.
The reason is straightforward
① It is considerably cheap! ② Even though it is cheap, the quality is normally strong and can be used. ③ Since it is used a lot, you can purchase in large quantities.
I will keep this item in my favorites and I will buy it if I lose it.